Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!goblin1!goblin3!goblin.stu.neva.ru!news.netfront.net!not-for-mail
From: Wanja Gayk <brixomatic@yahoo.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: Mirror an image
Date: Sun, 6 Apr 2014 20:18:52 +0200
Organization: Netfront http://www.netfront.net/
Lines: 58
Message-ID: <MPG.2da540be1aa5795117@202.177.16.121>
References: <2299213c-18fc-4e55-ab39-22dce863b255@googlegroups.com> <jt2mj9t2uv0jdos76t4otlb8lgfoc1udnn@4ax.com>
NNTP-Posting-Host: 77.177.60.159
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Trace: adenine.netfront.net 1396808341 60576 77.177.60.159 (6 Apr 2014 18:19:01 GMT)
X-Complaints-To: news@netfront.net
NNTP-Posting-Date: Sun, 6 Apr 2014 18:19:01 +0000 (UTC)
User-Agent: MicroPlanet-Gravity/3.0.4
Xref: csiph.com comp.lang.java.programmer:27962

In article <jt2mj9t2uv0jdos76t4otlb8lgfoc1udnn@4ax.com>, Roedy Green 
(see_website@mindprod.com.invalid) says...
> 
> On Tue, 1 Apr 2014 07:44:03 -0700 (PDT), pgmbento93@gmail.com wrote,
> quoted or indirectly quoted someone who said :
> 
> >dont pay attention to the the comments.. what can i do? im new in java and =
> >i dont know what to do
> 
> The trick I suspect is to use an Affine transform to map each point to
> its corresponding new position.
> 
> See http://mindprod.com/jgloss/affinetransform.html

Mirroring is actually much easier: Just use a negative width or height 
for the Graphics#drawImage method.

Without any test, this would be my first, rough idea:

The image:
+-----+
+AAAAA+
+BBBBB+
+CCCCC+
+DDDDD+
+-----+

public void paintComponent(Graphics _g){
 final Graphics2D g = (Graphics2D)_g;
 g.setClip( /* upper half, covering lines A and B */)
 g.drawImage( image, 0, 0 , width, height); //height > 0!
 g.setClip( /* lower half, covering lines C and D */)
 g.drawImage( image, bottomLeftCorner, width, -height); //height < 0!
}

Should result in:
+-----+
+AAAAA+
+BBBBB+
+BBBBB+
+AAAAA+
+-----+

Not sure if that's bottom half corner or middle left, but that's just 
one attempt away, if it doesn't work as expected.

Have fun.

Kind regards,
-Wanja-

-- 
..Alesi's problem was that the back of the car was jumping up and down 
dangerously - and I can assure you from having been teammate to 
Jean Alesi and knowing what kind of cars that he can pull up with, 
when Jean Alesi says that a car is dangerous - it is. [Jonathan Palmer]

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---